20 Questions (%)

Total cost of Joseph's lunch?

• $2.21

• $10.79

• $13.17

• $15.21

Answer explanation

13 x 1.17

• 0.000625

• 0.00025

• 0.065

• 0.025

Answer explanation

1/2% = 0.005

0.005 x -0.5 x -0.25 = 0.000625

Total price for 4.5 pounds of apples?

• $4.77

• $6.48

• $6.75

• $6.93

Answer explanation

1.60 x 0.90 = $1.44 per pound

1.44 x 4.5 = $6.48

Original number of cups

• 400

• 570

• 630

• 800

Answer explanation

15% of the remaining cups: 90/0.15 = 600 cups remaining on the 2nd day

600 remaining cups + 30 cups from the 1st day

630 total cups

Which expression represents a strategy for estimating the total output of wheat, in tons, in 2015?

• 20 + 10 + 5

• 20(10)(5)

• 20+1.1+1.05

• 20(1.1)(1.05)

Answer explanation

100% + 10% = 110% (or 1.10 .... or 1.1)

100% + 5% = 105% (or 1.05)

(Whole) x (%) x (%)

20 x 1.1 x 1.05

Which expression also describes the discounted price, in dollars, of the hat?

• 0.2x

• x - 20

• x - 0.2

• x - 0.2x

Answer explanation

price - 20%oftheprice

x - 0.2x

Which two expressions each represent the sale price of the item?

• A and E

• B and C

• B and D

• C and D

Answer explanation

B: You pay 80% of the price, or, 0.8p

D: You pay: Price - 20%oftheprice, or, p - 0.2p

How much will Lea pay, without tax, when she buys the computer that Saturday before 9:00am?

• $148.00

• $160.00

• $240.00

• $252.00

Answer explanation

400 x 0.70 x 0.90

(30% off means you pay 70%)

(10% off means you pay 90%)

How many of Jordan's name tags are red?

• 55

• 90

• 110

• 145

Answer explanation

Blue: 200 x 0.35 = 70

Yellow: 200 x (3/8) = 75

Red: 200 - 70 - 75 = 55

What is the total amount of money in her savings account at the end of the 3 years?

• $9.45

• $79.45

• $94.50

• $164.50

Answer explanation

4.5% interest per year: 70(0.045) = $3.15 per year

Interest earned in 3 years: $3.15 x 3 = $9.45

Total = $70 + $9.45